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20130208
20130208
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attacks under president obama. >> new details op a cable car accident in san francisco that sent seven people to the hospital this week. we know a bolt on the tracks brought that cable car to a grinding halt yesterday, but where did that mysterious bolt come from and why didn't the emergency system kick in before that cable carl hit the bolt? nbc bay area's joe rosa ta junior has the answers. >> san francisco's cable cars are the city's picturesque ambassadors to visitors from around the world. but yesterday they showed one group of riders their ugly side. today inspectors from the state puc examined the tracks at powell and washington where car 25 came to an abrupt halt before hitting a bolt in the tracks. sending seven people to the hospital. today, muni officials revealed an bolt came from their own system. >> to cause -- the cause of the incident was in fact a loose bolt that came from the screw plate. >> muni said the bolt came loose from one of the 41 switches along the system, which are visually inspected every day. >> what we do now in addition to visually checking them is that
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